/*	$OpenBSD: urem.s,v 1.5 2013/07/05 21:11:57 miod Exp $	*/
/*	$NetBSD: urem.s,v 1.2 1994/10/26 08:03:37 cgd Exp $	*/

/*-
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Donn Seeley at UUNET Technologies, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)urem.s      5.6 (Berkeley) 4/15/91
 */

#include <machine/asm.h>

/*
 * Unsigned modulus, PCC flavor.
 * urem() takes an ordinary dividend/divisor pair;
 */

#define	DIVIDEND	4(%ap)
#define	DIVISOR		8(%ap)

ASENTRY(__urem, 0)
	movl	8(%ap),%r2
	jlss	Leasy		# big divisor: settle by comparison
	movl	4(%ap),%r0
	jlss	Lhard		# big dividend: need extended division
	divl3	%r2,%r0,%r1	# small divisor and dividend: signed modulus
	mull2	%r2,%r1
	subl2	%r1,%r0
	ret
Lhard:
	clrl	%r1
	ediv	%r2,%r0,%r1,%r0
	ret
Leasy:
	subl3	%r2,DIVIDEND,%r0
	jcc	Ldifference	# if divisor goes in once, return difference
	movl	DIVIDEND,%r0	# if divisor is bigger, return dividend
Ldifference:
	ret
